Answer:
its 42
Step-by-step explanation:
315-18+81=378
Correct mean =378/9=42
Answer:
1
Step-by-step explanation:
x+y=-9
y=-x-9
So slope of original line is -1.
The line perpendicular to the original line is -1/-1 = 1
Answer:
0?
Step-by-step explanation:
4-4=0
I think the answer is D: interview every student who eats lunch in the cafeteria